Painting/modelling Hacks

Hey all, just thought it would be cool to have a place to share our collective painting and modelling hacks; those little tips and tricks that give amazing results for little effort. Once we have a few, we could compile them into a handy little list. So, I'll get the ball rolling with one I heard on a podcast and have been using since:

- PVA glue is a better gap filler than liquid greenstuff for small gaps! (put a small bead of it in the gap and voila! - May take a couple layers :D) It is certainly a lot easier to control.